If the instantaneous current in a circuit is given by `I=2 cos (omegat+phi)` amperes, the rms value of the current is
If the instantaneous current in a circuit is given by `I=2 cos (omegat+phi)` amperes, the rms value of the current is
A. 2A
B. `sqrt(2)A`
C. `2sqrt(2)A`
D. 0A
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